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<br />I Schoell & Madson, Inc. <br /> <br />. Engineers . Surveyors · Planner.s <br />- - Soil Test;ing . Environrnent;al ServIces <br /> <br />S. 1 Minnetonka, MN 55305-1 525 <br />I 1 05BO Wayzata Boulevard, ulte <br />Office 612-546-7601 Fax 612-546-9065 <br /> <br />August 6, 1997 <br /> <br />Ms. Kate Drewry <br />Rice Creek Watershed District <br />Suite 330 Arden Plaza <br />3585 Lexington Ave. No. <br />Arden Hills, MN 55126-8016 <br /> <br />Subject: <br /> <br />Drainage Calculations <br />Roseville Technology Center <br />Roseville, MN <br /> <br />Dear Ms. Drewry: <br /> <br />Transmitted herein are the drainage calculations and storm water management <br />plan for the Roseville Technology Center project. The results of the drainage analysis <br />are presented below. <br /> <br />I. Water Quantity. The proposed basin will provide detention to match the existing <br />conditions for a 1-year design storm and restrict the 1 OO-year design storm to the <br />existing 1 O-year design storm. The building has been raised two feet from the <br />original submittal package. The orifice on the outlet structure has been reduced <br />to utilize the additional pond storage. With the additional "bounce," the proposed <br />runoff rates have decreased. A comparison of runoff rates is shown in Table A. <br /> <br />TABLE A <br />RUNOFF RATE COMPARISON <br /> <br />Design Storm Existing Conditions Proposed Basin Elevation <br /> Conditions NWL = 930.0 <br />100 Year 13 cfs 5 cfs 933.5 <br />10 Year 8 cfs 4 cfs 932.3 <br />1 Year 5 cfs 2.5 cfs 930.9 <br /> <br />~ --- - @l)€Jl 40 (j/ea}t/j 0/ EnjtvV~ ....--:.::Ii <br /> <br /> <br />, - ... . . - ~.__.. . -- --- ~ <br /> <br />Affirmative Action Equal Opportunity Employer <br />